反应详情

To a solution of KOH (25 g, 440 mmol) and K2CO3 (25 g, 180 mmol) in H2O (400 mL) was added 2-bromobenzoic acid, (38.2 g, 190 mmol), followed by glycine (25 g, 330 mmol) and CuBr (540 mg, 3.76 mmol). This mixture was heated at reflux for 4 h. After cooling to room temperature, the mixture was filtered over a fritted funnel to remove traces of Cu and the filtrate was acidified to pH 3 with concentrated HCl. The precipitate was collected and dried to obtain 32.44 g (88%) of the title compound, mp 225.9°-226.2° C. (decomp., white foam); 1H NMR (DMSO-d6) δ 12.4 (br, 1H), 8.06 (br, 1H), 7.80 (m, 1H), 7.35 (m, 1H), 6.60 (m, 2H), 3.99 (s, 2H); 13C NMR (DMSO-d6) δ 171.8, 169.7, 150.0, 134.4, 131.7, 114.7, 111.5, 110.6, 44.4; MS (EI, m/z) 195 (M+) .

1. temperatureThis mixture was heated
2. temperatureat reflux for 4 h
3. filtrationthe mixture was filtered over a fritted funnel
4. customto remove traces of Cu
5. customThe precipitate was collected
6. customdried